I have namechanged in case identified in RL.
Basically, DP's best friend, who is married, no DCs (and has been for 7 years since his mid 20s) has been saying some things that I find a bit..off.
On three separate occasions he 'joked' about going out on the pull when his wife was away with work. I reminded him that he has a wife. He said 'oh you know it crossed my mind'. A few weeks ago he was talking about his best chat up lines. 
I mentioned this to my DP and he said 'oh he was only messing around'.
Thing is, his wife is lovely and I'd hate to think he was fucking around.
I know it's non of my business but it's playing on my mind.
Another of DPs close friends had a few one night stands.
Now I'm looking at my DP thinking 'well, if that's the company you keep then you would too'.
Does this all sound like male bravado? I'm losing bloody faith here.